I have lived on both sides of sydney and find them relatively the same
Depends how close you want to be to the city and if you like open space??
Campbelltown is nice, im in the good part and its relatively modern..all new housing estates are going up and its cheaper liveing out here and the M5 is pretty good most days just gets a bit backed up if there is an accident
Campbelltown is misunderstood, everywhere there is good and bad!!
It all depends on the lifestyle you are use too..
Let us know if and when you plan on moving will come and say hi